Abstract
The magnetic field effect on the intensities of monomer ( I M) and excimer ( I D) delayed fluorescence of pyrene has been found to be identical. This result suggests a common spin-selective step in the processes giving rise to I M and I D, and is discussed in the light of previously proposed mechanisms. An unusual solvent effect is found on the I M ( I D) versus field strength curves. This is attributed to photochemical doublet-radical formation. Doublet-radical formation affects the field dependence of I M and I D through spin selectivity in the triplet quenching reaction.
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